1. Effect of graphene addition on the mechanical and tribological behavior of nanostructured AA2124 self-lubricating metal matrix composite
- Author
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A. El-Ghazaly, Hanadi G. Salem, and Geraldine Anis
- Subjects
010302 applied physics ,Materials science ,Scanning electron microscope ,Graphene ,Composite number ,Metal matrix composite ,02 engineering and technology ,Tribology ,021001 nanoscience & nanotechnology ,01 natural sciences ,law.invention ,Mechanics of Materials ,law ,0103 physical sciences ,Ultimate tensile strength ,Ceramics and Composites ,Extrusion ,Composite material ,0210 nano-technology ,Ball mill - Abstract
In the current research, the mechanical and tribological behavior, and structural evolution of AA2124-3 and 5-wt.% graphene (G) composites prepared by a combination of ball milling and hot extrusion were investigated. Properties such as macro and micro-hardness, nanohardness, tensile and lattice strain were characterized. Wear rates, coefficient of friction (COF) as well as nanoscratch testing were used to investigate the self-lubricating tribological behavior. X-ray diffraction, optical and scanning electron microscopy were employed. Hardness of the AA2124-G composite increased by 133 and 102%, the wear rates decreased by 34 and 25%, and the COF decreased by 25 and 9%, for the 3 and 5 wt.% G composites, respectively compared to the plain alloy extrudates. The AA2124-3 wt.% G composite displayed the least scratch depth and width and highest nanohardness. The uniform distribution of the 3-wt.% G-particles within the Al-matrices formed uniform G-tribofilm, which enhanced the tribological behavior of the composite.
- Published
- 2017